351 Windsor heads were the way to go 20+ years ago when no aftermarket heads
were available.
If memory serves, the proper 351 W heads to retrofit on the small block are
the 1969 (C90E) and 1970 (D00E}.
Others--as you have found out---reduce compression radically & kill power.
But w/a so many better engineered aluminum (and some few iron) aftermarket
heads now available for a reasonable price, why mess around with lesser
parts?
I picked up a set of brand new, still in the box GT-40 heads on the Corral
parts list for $500 AND he threw in the ARP head bolts.
BTW---I still have a set of 6.095 hardened Ford Motorsports pushrods for
this old school conversion, should anyone want them.
Al J
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