ive got a 347 scat crank rods and pistons ,v2 vortec blower ,pro comp heads alloy 550 hp out of box ,red ford injectors ,it will be going into my eb gt,using gt40 inlet will that inlet bolt up on these heads ,will these parts be ok ,what it to be a street car 400hp rwp to 450 would be nice ,was going to use standed block and use a main girlde if i can find a block and girdle ,will this work

1) Pro Comp heads don't flow anywhere near enough air for 550hp
2) GT40 intake may not line up with the ports on the Pro Comps, every pair I have seen won't align with a standard type manifold. I don't know what manifold they are made for.
3) Every 400rwhp 5.0L I've seen using a blower and a late model efi block hasn't lasted. The factory block is not designed to handle the stresses of a blower, stroker and ~500fwhp.
4) Mains girdles unless they are dowelled to the mains caps do not acheive much.

IMO save the stroker kit, get some good cylinder heads (AFR, Trickflow, Edelbrock, RHS) an aftermarket block and do it properly once.