Can you port match a standard intake so the runners line up with those on W-2 heads?
They are 250-ish in stock form but go much higher expertly ported:
FLOW #s
LIFT--------AS-CAST---------PORTED
.100------62.1/44.9------------82.8/55.2
.200------124.9/101.8---------148.4/107.6
.300------179.4/138.0---------205.3/160.4
.400------220.8/151.1---------255.3/193.2
.450------238.7/155.2---------273.3/203.6
.500------252.2/155.2---------291.5/208.7
.550------258.4/155.2---------303.9/213.9
.600------260.5/155.2---------313.3/215.0
.650------253.6/155.2---------324.3/215.7
.700------253.6/155.2---------320.8/217.0
All #s at 28 of water
No flow tube on the exhaust
2.02/1.60 Ferrea 6000 Series Valves
30 Degree Back Cut On intake valves.
[numbers courtesy Shady Dell]