You don't need that stroker kit for that hp range. Budget sounds a bit low to begin with so why not do the 400 as a 400? Saves money. Even the heads you have will be able to make the hp level you want. To make the heads work you have, I'd put in 2.08" intake valves and 1.71" exhaust valves after changing the heads to screw in studs. I would look at a hyd roller cam so you could have a better profile for better driving. But if you want a flat tappet type then a cam along the lines of the Comp Cams 286AH-12, with 236/244 @.050", .489"/.500" lift (1.5 rated ratio) 112 LSA,(makes it able to run pump gas, otherwise a 110 lsa). A TYPICAL dished piston in my opinion isn't the way to go here. Too much quench loss. I would get the Speed-pro pistons, rings, and a good aftermarket stock lenght rod. So close to cost of fixing and reworking stock rods anymore, it's not worth chancing the stockers. Try the new Melling Select oil pump. You will like the hot oil not losing pressure with it like can happen so easily with the others.
What intake do you currently have? I'd go either Torker II (because of hood clearence) or performer RPM. Get a 1 3/4" primary 4 tube headers not the lousy power robbing poj's 1 5/8".
Holley Street Advenger 870. The most tunible and easest to do so street carb holley has ever had. Tuned will deliever good drivability.
I made over 425hp with this same combo and the 70 small valve #16 heads with the installed larger valves I recommended..
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