crosswind air gap or stock 4bbl manifold

more benefit or more loss ??

thinking about changing from
1971 OEM spread-bore 4bbl cast intake to crosswind air-gap intake

guess i will loose some power at the low end ...

but maybe gain some at higher rpm




- 273 .040 over

- CR 8.8:1

- Cam specs: lob 112, duration 050 lift 204-214, ad dur int.270 exh.280 Valve lift .420 .443

- Heads #920 runners opened up to 340heads size, bowl blended, valve bosses grinded down, exhaust runners and combustion chamber polished

- Valve springs compcams 901-16 (353lbs seat load 101 closed load 242)

- Headers

- Rear end 3,91 with sure grip

- Tires 26.1 hight

- Holley spreadbore 650cfm (4011)