they are heavier than a gen 3 v8 and much heavier than a dodge hemi 2,
buick/rover v8 and 370z v6.
A Nissan v8 pushrod Y40 stock with alloy heads easier to maintain and oldschool no pollution gear. You just have to find one or import one from japan.

{ive been running a y44 nissan v8 for about 12 years now runs fine neat fit in engine bay
on pulling a y40 apart we found they well made 4 bolt mains valve guides 4 barrell manifold but never found anyone who hotted one up or made parts for them interestingly the nissan 6 cyl flywheel bolts up to the crank} end quote.