What efi system is best for a 4.5 pfi cadillac engine7

[S.O.B.B.]

Thanks Bob. I was reading on tgo about it last night.I kind of understand what it is but I don't see what reason for which setting is used on which distributor. I copied the whole latency table and burned that this morning. Could barely drive up the road.but like a dumb ass I changed more than one thing.I also copied the timing table for a corvette that I got off superchevy.so I'm gonna try the other latency table that I didn't try.that will be the 3rd table.I'm gonna try to get me a 2240 caddy ecm and read the chip so I can copy a few tables from that because I don't think any of the swirl port head setting work on this engine.it's more like a pre efi sbc engine.I do have most of the stock 4.5 engine specs so I can calculate things but my lack of experience here is making it a little difficult. I had originally started and ran this with a small cap grafted onto the top of the oe caddy distributor. But the phase was off.so I made it adjustable and put a hole in a old cap to get it set right.it had pretty much the same issue.so I switched to the caddy distributor and icm.it's different but feels like the small cap did when the phase was off.with the large cap I have no way to cut a hole to see where it's firing. Leaves me guessing till I get the read from a caddy chip.I'll keep trying.thanks