I have a set of those and we tried them on a '50 Chev with a 292 but they hit the lip on the firewall in those early years and the parking brake linkage would have been in the way if we had got that far. Maybe a set of shorty headers will do the trick for you.

Ontario Inliners
1965 Chevelle
1940 Chev
1965 Chev Pick-up
1970 MGB Roadster