[Coley]

Wow.....well, you are moving in the right direction to get things in the 1500 rpm range in terms of performance.
One thing to check to get started...are the 461 heads. Do they have the extra/additional end tapped holes?....if not, and depending on what your alternator, a/c etc brackets are...they might not work, given that they usually don't have these needed holes for the truck stuff.

If there any info on the cam?....you are going to want lift...not duration (ie: lumpity, lumpity) for a heavier vehicle needing torque....like a truck.

all good
Coley