Two things Grey245 -- 1. I recommended an M46 because his M45 bellhousing will bolt on to replace the slant mounted bellhousing on M46's likely to be found coming from B21-23 cars with their slant mounted bellhousings.
2. Regarding your B20A - I power my '69 144 (the Volvo From Heck) with a B20B with a later cylinder head with the 44mm intake valves, a K cam, twin SU's and a little porting. If you really want to make the engine come alive--raise the compression ration. I don't know exactly what kind of power I'm making but it's easily more than a match for a good running B20E. - Dave
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