360 roller combos
On a budget..focus on pistons, heads, cam, intake, carb, headers.
But don't forget a Double Roller Timing Set, and a High Volume oil pump.
Stock valve size 1.88/1.60 is fine...but you will need some .550" capable springs.
For the cam,
I don't know who makes Hyd Roller Cams now for mopars...but I got my old one from Crane Cams...it was about $320 for a custom grind.
I recommend a more aggressive cam since your gonna be sticking with the roller lifters.
Try to find a split duration 223*/225* @ .050, .520" to .530 lift 110 center....it translates to a 284 with some more thump.
Should be good for 450-500hp with 9:1 - 9.5:1.
For the Induction,
Minimum of 750 Double Pumper on top of a Edelbrock RPM Air gap with Holley Blue pump and regulator at 6-8psi.
Headers are a must, dual 2.5" exhaust pipes or bigger.
Should put over 350hp/430 ft lbs to the ground in 110* weather.....all day on pump gas...stock stroke....and you should be able to spin it 6500 no sweat.