Fi on stock intake manifold

trapster said
Well from the way I think TBIs work is they are not an on demand per barrel fuel delivery like a carburetor is. SO intakes that draw air from all 4 barrels for each cylinder (single plane) work better because fuel from the TBI is delivered equally to each barrel. If a cylinder is only drawing from one or two barrels then its fuel mixture is going to be screwy at lower rpms, because part of the fuel it needs is being delivered to barrels not being used at that point. It all averages out in the end, but it isn't as efficient at lower rpms.

I've run the older Holley 2BBL and commander and then Holley HP computer with 4BBL TBI on mine with no issues. This was an Edelbrock "RPM" I'm not absolutely certain, but "I think" the manifolds used on the late 80's LA factory TBI engines were also 180 manifolds. Maybe someone has one to confirm, mine is hopelessly buried below outboard motors LOLOL

Can't tell for certain these photos sure look like a 180 manifold to me

Another shot. Looks to me like the divider has been cut, so don't know what it was from factory