Hi John,
The 444 conversion was designed to be absolutely legal in APBA by using the existing crankcase cover. BTW: There is no welding - only aluminum filled epoxy and bolts. I've not queried the AOF, but Jim Robb offered to take it to the NBRA Nationals and was told it is illegal there.
Your Nydahl front end will work nicely, but may be bounced by the APBA as this "made for racing" part takes place of the "recognizable block and crankcase" rule. My interepretation is the rule was meant to keep factory race parts out; I'd build it anyway and petition a rule change if needed.
As for the twin Mercs, exhaust can go either way. The thought of building one just for the sound intrugues me, but the result would be more weight than my 13' Ropp can handle!
Tim
BTW: The 62 ci Merc never did well in Alky or Mod according to Bud Parker and others I've known that tried to run it. The 444 is still your best Merc FE.
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