Stock magnum bottom end with tricj flow heads what cam?

Maybe aftermarket magnum heads (no cracks) iron (Chinese, engine quest, RHS/Indy), or Edelbrock aluminum.
3.91 gears,?, maybe more camshaft roller version of the lunati 60403
Edelbrock or Chinese airgap intake
Speedpro H116 or Keith Black 107 pistons
Scat I beam rods, 800 avs Edelbrock carb
Double or true roller timing chain, kevko oil pan & pickup

You will ‘hold your own’ for what you have

Do the measurements, mill heads or block, calulate for gasket thickness and shoot for .035” quench

You say budget, then you say, "New lifter rockers oil pump and double timing chain. Is it feasible or due i need to save for something like the hot rod IMM engine build. With a ball hone, icon forged piston 10.4:1, bigger 565 lift can mother thumper, imm eq ported heads with larger valves."
What is the budget?