you need to decide what fuel to run or what is available.
8.5:1 dcr is a starting place for your aim. sooooooooooo,,,,,,,,,,,,,,
figure how many ponies you want/need first
we know its a 383 so now figure what heads you need?,,you have AFR 195s
we know that those heads can support close to 600 hp if we have enough CR/and breathing,with fuel to support the parts.
now you can reverse engineer the engine
how many RPMs are you willing to ring out of the engine,?
what fuel will you be using?
what camshaft will get the RPM and get as much flow out of your AFRs as possible in that RPM range.(this will take some time planning because an engine that revs 7500 rpm has a fairly long duration cam that may not match your application and matching parts)
Like Techinspector says"(paraphrased) the effective RPM band is usually 3500 rpm or LESS"
so that 7500 RPM engine will come alive around 4,000 rpm or higher,,,do you really want that?
If you want an engine that peaks at 6,000 rpm,will that engine make the horse power that you want?what total percentage of the available head flow will you be able to use?We need to run a couplesims with Richard? I would be looking for a tune that has peak power around 6800 rpm with those heads and a solid roller cam.
I know right now I wont agree with Richard,but thats good as you can decide for yourself what package works best for you and your application.
Off the top of my head( g2g2 work),,,I would use around 10.5:1
a cam in the low 240sº with .600 ish lift, icl/lda to be determined but start at 108º/108º,probably advancing ICL,,,,
fuel management flowing 850 cfm with single plane intake(Richard would use an RPM dual plane) 1 3/4 inch primary headers,tube length to be determined?
I would be aiming for 535-540 hp