Intake manifold questions

I had one on a 79 d100 with a 69 318 an a833od an RV cam, and 3.91s, for the truck that it was it ran great, better than I expected for what it was. I never got it high enough to run out of steam. I have also run an sp-2p on a diplomat ex squad that I had, it ran "alright" but I wouldn't say "great".
I didn't have both at the same time but I'd have liked to have ran those intakes on the opposite engine. Both had Carterbrock 625s on them.
I did seem to have more percolation issues when hot on the diplomat, don't know that the intake choice had anything to do with it... I'm thinking the truck was less a problem with that because the under hood area was bigger, more air space to carry the heat away. Both ran long tube headers too.
In both cases it was "what I had access to at the time".