[Bill Wells]

dont know the shoulder specs of the boss niner motor vs the 4.6 L ford modular motor..but the very latest spf's have a redesigned engine bay and steering linkage assembly that will now allow a 4.6L to be installed. prior versions would not allow a 4.6L modular engine to fit...suspect the boss niner is much wider and would be surprised if it would fit, but don't know. those nines look great and i saw pics of one stuffed into a cobra replica, but dont recall which brand it was. As i recall it is also a very heavy engine. and yes, as stated, the plugs would be easier to replace..bill.