HELP! Need 318 Head Suggestion (info provided)

I have a set of ported 302 heads with 1.88/1.60's feeding my 390, they work great, feed it pretty well up to aout 4500, runs great past 5K though.

Here's the deal. The closed chamber 318 head won't give you higher compression, but, with a piston at the top, you will get all the benifits of a good quench....... and helps run **** fuel.