750 holley vac secondary adjustments from 318 to 390 stroker

Setup was 318 engine, ported 360 iron heads, points ignition, weiand action plus dial plane intake, dougs headers, Cam is 224/224 250 465 lift 110 LSA And Holley 750 vacuum secondary. Engine had 7.8:1 compression will be 9.4:1 with the stroker. It is a manual trans, and at aproX 750 rpm idle it had vacuum reading of 14. I believe The jets in it are 68s, and 6.5 power valve. Building the 390 stroker short block, everything else will remain the same for now. How big should I go with the jets and power valve as a starting point?