There are no HP mods/re-programs available for the stock TBI computer setup. In fact, I think even stock replacement parts can be hard to come by. The stock computer probably wouldn't like the extra cubes, and the injectors may be too small for a stoker also.
You're '91 360 should have the "308" heads on it. They are the high point of LA head design and have better exhaust ports than all the earlier OEM designs. Only the later style Magnum heads are better. With your 308 heads, you can slap on any 4bbl dual plane LA intake and MP electronic ignition kit and your stroker will be done. You should have a roller cam, so you could use a more modern cam with faster ramp rates than us guys with the older LA 360's can use.
