If the 91 HB was or is an SI you can use that engien harness, just extend a few things. Use the ECU im sending you monday, and an 90-91 LS dist. I have one of those as well, I can sell for $65 + shipping
that distributor is designed for a SOHC motor, it will work however, it just makes more since to use one that fits properly and that's designed for that particular engine. I understand what it it's like to be on a budget. IF you cnat afford to get the distributor then you'll be alright. I was simply saying I have the dist. if you need it.