one of the resources i wish i had but couldn't find in one spot was exactly what we should buy/keep to do this swap
on my 93 rx7, this is what i used
motor/trans - obviously a LSx swap, i got mine from a 02 camaro, trans was a T56 6speed
engine harness - oem camaro harness, you'll need to send it out to get modified, or you can buy a pre-modifed harness from Pez or Rywire
computer/ecu/pcm - oem camaro ecu, you'll need to send it out to get modified, or you can get EMS like AEM or something, you'd need to tune it afterwards
headers - i went with spoolin' performance longtubes
intake - i went with the samberg kit, so it includes an intake/radiator combo, but you can run 90* off the throttle body and another 90* down as a cold air intake
mount kit - i went with samberg complete mount kit with driveshaft, had to get it powdercoated since it comes raw metal, you could also go with hinson kit
drive shaft - drive shaft shop makes one, keep in mind M/T and A/T RX7's have different rear diff flanges, so you need to get the correct one
radiator - i went with samberg intake/radiator combo, you could go custom, mishimoto, hinson, etc.
keep the oil pressure and water temp sensor from the 13b, so you could buy an adapter from autometer and keep the factory gauges
shifter - get a steeda tri-ax if you're using a camaro t-56, puts the shifter as close as possible to oem shift boot location
battery relocation kit - you can do your own extension or buy a kit, relocate it to any rear cargo bin or trunk space
exhaust - y-pipe or x-pipe to a 3" or 3.5" muffler, this is where you and your muffler shop/fab guy can get creative
power steering - Pez has a power steering line for $100, use a f-body pump
air conditioning - Pez makes a A/C kit, forget how much it is, i do not intend on keeping A/C
traction control - racelogic makes a kit, from $1200-1800 depending on what options you want, or if you go with AEM infinity, it has traction control settings, make sure you keep your factory ABS speed sensors since it'll save you a couple hundred bucks
clutch + flywheel - since the motor is out of the car, here's your chance to replace the clutch + flywheel kit to something better
clutch slave cylinder - these are notorious for failing, replace it with a new OEM unit for peace of mind, and get a remote slave bleeder to save yourself headaches when it comes to bleeding the clutch, i bought it from speedway and it was a 48" line that i ran up into the engine bay and mounted it by the brake master cylinder
fuel pump - i used a walbro 255, some guys used 94+ supra TT pumps
fuel lines/regulator - i used a fuel filter/regulator combo from a 03 c5 vette base, it's clean, simple, prefixed pressure to 58psi, and all stock lines from the motor, you could go with aftermarket but you'll end up spending more
rear diff - the stock FD one will work, some guys have gotten by with it, some guys break it on the first launch, but most people i know upgrade to a turbo-II FC internals in a A/T rear diff housing for an affordable upgrade, you can go 8.8 or cobra, those are more expensive
depending on motor/mount kit/intake manifold/intake arm set up, you might need to notch the firewall lip for clearance, "massage" the transmission tunnel for header clearances, notch the hood, etc.
