Ah, yes, the "behemoth 427" argument again.
The engine weights listed on the ERA website:
(
http://www.erareplicas.com/engines.htm#fe)
show a '69 351W (4V) weighs in at 515 lb; a 427 (Galaxy, 4V) weighs in at 590 lb; and a '68 428 CobraJet with aluminum intake is 570 lb. This was original weight for the installed engine. IMHO, the difference in weight of 75 lb is well worth the trade for the extra torque. The "behemoth 427" is one of the more enduring urban legends around. Drop an aluminum manifold and a set of aluminum heads on the 427 and it is nearly identical in weight to the 351W; it just has 50% more torque. If you'd like to see one, give me a buzz. I'll give you the point that the 351 is smaller.
And, 427's do not LEAK
oil. They're just marking their territory.