Edelbrock won an award for the research they did developing the manifold for these engines. They found that the intake pulse flow was different for the passenger side of the engine because of the firing order. They compensated for this and found more power due to the change in port size.
I noticed the difference in port size and was going to open the ports, but I called Edelbrock and they said (absolutely) don't do it. I have several of the Edelbrocks on different trux.
I have a 91 dime with a 95 Camaro 3.4, 5 speed, 4.10 rear gear. The engine has every bolt on and monster cam (.500 lift, .486 advertised duration), roller rockers, true roller chain/gears, Mallory distributor, Edelbrock/Holley, headers, 3" exhaust etc. It runs low 14s at the 1320. Sounds like a pro stock rig.
I am familiar with the Isuzu 31. I don't know if the block is double drilled (starter motor) but the starter is on the driver side for the Isuzu version of the 2.8/3.1.
You may want to check that. The S10 is on the passenger side.
BTW, the Isuzu V6s have the same bell housing bolt pattern as the 3.1....
Do I want to sell the Offy intake? At this point no. When I return home (haven't been home in 2 1/2 years (!), I'll look at what I have and see if I really need it. I have about 10 different intakes for the 60* V6 Chevy engines - including 2 Weber intakes for IDA/IDF downdraft carbs. Most of the stuff I have is meant for projects, but at this point in time, I am realizing that I will never complete a quarter of them.
I've been 168 days in hotels so far this year...
I anticipate going home in the next month unless they drag me into the Hurricane Florence crap. I have a bad feeling about that.