Hello Rob,

The cvh head - even when properly ported is still a relatively poor flowing cylinder head.
The Jenvey plenum inlet manifolds are designed to flow far in excess of what any CVH head would flow. This would largely be a waste of well earned money - and a mismatch of inlet port cross sectional areas (very important if one is looking for power gains)

Too big an inlet is just as bad as too small an inlet - they must be matched and designed for specific rpm range and engine sizes.

Just my opinion of course.