New guy here.  Fortunate enough to have a small shop in my backyard with good but old equipment.  In my retirement, I do modest street rod engines mainly the older stuff todays shops don't want to bother with, ie. flathead V-8's & V-12's, early hemi's, 383 Mopars etc, along with the requisite SB and BB chevys.  Now....need some info/advice.

My current engine is a 292 Y block.  Have .040 over SP cast flat top pistons.  I'll do the deck close to 0 with a BHJ fixture any my WVN broach, target static compression is 9.0.  Heads are ECZC which, according to my research on this and other sites, are good for smaller chambers.?  It needs new valves.  I can get the 1.920 valves for only slightly more than the 1.780 valves it has.  My inclination is to do it (we've always been told size matters) and leave the exhaust 1.510 due to the smaller chamber.  I would open up the valve pocket with a 75* hog slightly and finish with a 60-45-30 seat.  It would cost slightly more in machine work for the owner, so my question is.... is this the right thing to do for the engine and the owner?  He is planning on using an aftermarket cam in the 268-270 adv. range with @.450 lift and a 4V carb.  Going in a mid 50"s pick up and will be a moderate driver/ streeter.  Sorry for being so long winded.  All opinions/reccomendations appreciated.

Thanks,

Warren