Seems like the old boy @the machine shop drilled the heads & intake both in order to use them. May even used an external crossover in the rear. Coolant goes thru the heads different than the older engines. Ol' JD is 67 & been a machinist all his life, has had his own shop since 1975(still in the same place). If I get a chance I will ask him about it. Seems like he said "it ain't sposed to be done", but he did it quite often on circle track engines if the guys couldn't pony up the $$$ for Eagle or World heads. Brian
