Speedpro 2355 pistons on the 67's forged crank and the motorhome rods (probably stressed less) in your motorhome block .You'll need to rebalance your rotating assy. Your 452 heads and thin gaskets should give you about 9:1 CR for best use with pump gas (915's were prone to cracking and aren't designed for unleaded). Stock intake with a thermoquad (best). factory BB intakes actually flow quite well for 400hp so spend you money elsewhere. .060 wall chromemoly pushrods, HD Mopar performance stamped rockers, Lunati Voodoo 60301 cam kit with stock motorhome valve springs with rotators removed or 60302 cam kit with their springs. Good 3 bolt timing set. Valve guides cut for teflon seals.

I wouldn't use the torker intake and that comp cam for your heavy car cause it would be a dog below 2500 RPM ,cruising would suck.