Smallblock intake manifold shootout.

I helped a friend in the 60's race a Chevy SB gasser with 6 duces. We always opened the hood and had a rag handy to put out the carb fires if it backfired while cranking. I think it was a 283 +.125 301 with 327 heads - ran good. Drag racing has come a long way.
I've used LD340 on a solid camed 340 & liked it, but didn't think the Iron 340 manifold lost much to it.
I liked a Holly Street Dominator on my 360. It was ported somewhat and had a divider in it - I had 904 and the motor liked the divider.
All the comparisons I read the LD340 does well but Performer RPM's do better.
Chryslers Engine book has been a good refrence for me. Match the intake to your combination.