I need an ACFZ prom from '87. (maybe 86 or 88, not sure if available then).

I bought an '87 computer to update my '85 E4ME CCC car but I need the correct/better prom.

If you have one, let me know. Located in TX 78610

What is an ACFZ prom?

Gm 16070135 might be a hard find always this
for 305 Automatic

https://www.ebay.com/itm/254974665046

Prom used in the L69 (305HO Qjet) engine.
ACFZ is the code printed on the original computer and on the chip.

i'm putting together a 0.020 350 for the firebird and want better advance curve than the LG4. I may have a line on custom burned prom with even more aggressive ZZ4 timing curve.

I believe I have one from a Monte Carlo SS which came factory with the L69 motor

I believe I got this pm or text me my number is (612) 860-2513