I thought the 383's liked a longer duration/ bigger lift on the exhaust side of it.But given a towing situation/street van,it might not be significant.

The vacuum shouldn't be a issue here.TBI's systems need to keep the vac up.

Heading out to the shop to get work done.I'll look up those number cams maybe later today.

I just want to add that I am suggesting we keep mindful of the parts in this engine while building the numbers for it.Just a two cents thought I have.

Thanks guys.

Gary