Build suggestions for 340?

Two more questions: is there any reason to buy new cylinder head bolts? Mine seem fine; every bolt came out smoothly.

And - is this a decent harmonic balancer? Mine seems fine, but is 50 years old...
Pro Race Products Pro Sport Harmonic Balancer

Jim
that is the balancer i'm using on my 426 stroker seems fine have not had a problem in 5,000 miles , good for the price as for rods I used Molnar h beams on my stroker molnar i neams on my 340 a bit more expensive than eagle or scat i just think they are betteqhality m just my opinion which ain't worth much