im looking for a prom from an 85 corvette.

I'm doing a swap from a 305 tpi to 350 tpi.

I acquired an 87 ecm W/ prom and wire harness. I was told this will not work on the 85 tpi. due to different sensors and relays.

so i did some more research and the vette and camaro had the same ecm and the difference between the two was the prom.