[storm9c1]

I agree. With the exception of the collector (2" on trucks versus 2 1/2" straight dumps on Vettes), they should be the same. I don't think the ports are different. Though if you have some time and tools, a die grinder can really make a difference! :-)

I've always run ramhorns, even on my 383 stroker. It's a low RPM beast, and usually stays below 4000 RPM, and never sees over 5200 RPM. It's a workhorse and needs nothing special. Ramhorns work great, no problems, no leaks. They just work. And if they fail, I can order new ones all day long from local parts stores. I do run good foil gaskets with mine, always have on all cast iron exhaust manifolds on all SBCs. New parts store ramhorns come with them in the box. Every once in a while, I had a cheapo gasket blow out, but the good foil Felpro ones work fine. But as mentioned, some choose not to use gaskets, which is fine too. YMMV.

By the way, that's cool running ramhorns on a LT1. The stock LT1 manifolds flow better, but I can see how the ramhorns would fit better in some cases.

The other thing I find interesting about your swap from a C-60 is the engine type. Back in the older days, a C-60 would have a tall deck engine. Usually like a 366, 409, or 427. Or even a huge 351 V6.