[Will]

You could order dished pistons with your stroker kit to get a streetable 9-9.5:1 CR with your existing heads.

Then have the large valves installed in them and get them converted to screw-in studs. They'll still need some port work to flow as well as an original large valve set of heads, but with porting they can go up to around 240 cfm easily.

Depending on your goals and budget, it may be easier and/or cheaper to just buy a set of 6X or 5C heads, or some Edelbrocks or KREs and be done with it.

With good flowing heads, 400 horsepower from a 461 cid engine is easy as falling off a log. If you were to put some Edelbrock heads on your engine, keeping everything else as you outlined, you'd be closer to 475-500 horses.

The power is in the heads!

If your budget is limited, then forget the stroker kit and buy some good heads instead. A set of 72cc Edelbrocks, and a Crower 60916 cam in a 400 should easily make 400 horses.