It depends on you.
The since the 16s have screw studs they are also big valve heads and even with the 068 cam will buy you 15 more Hp and the same gain in peak TQ over running the 15s.
If the 15s are not on the motor and you wanted extra insurance against the studs pulling out you could check into getting the studs pinned.
Another consideration is if the 16s are less of a drop on due to having higher mileage then your low mileage 15?
With either head even if they are not rebuilt you want to replace the valve stem O rings so you don’t burn oil.
Both heads will provide high enough compression that octane reduction due to oil getting in the chambers could make the motor far more likely to ping or knock.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs!
And he was not talking about 1/8 or 1/4 mile ETs!
1) 1940s 100% silver 4 cup tea server set.
Two dry rotted 14 x 10 Micky Thompson slicks.
1) un-mailed in gift coupon from a 1972 box of corn flakes.
Two pairs of brown leather flip flops, never seen more then 2 mph.
Education is what your left with once you forget things!
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