Have a 90 crx I also have a 95 gsr laying around with shifter linkage wireharnnes and ecu how do I make this work in my crx. It'd has a cable shifter? And all plugs on shock towers are different

 

What trim is your car? You can't directly use the engine harness and depending on what model your car is will dictate the other wiring you'll have to do. You can use the GSR ecu but you'll have to convert to OBD1 at the ecu and distributor using adapters. Here's an idea aside from the wiring

88-91 Honda Civic/ CRX EF B-Series Swap, DIY