I like the idea of the 349, with all the aluminum headed 408s out there, taking somewhat discarded parts (360 crank,heads,318 block) and make something out them, a 349 close enough to a 360 shouldn't be a huge power difference especially if you can bore out the 318 to 4" but seems like a hard way to give up 0-18 cubic inches. Could see if you had an engine machine shop maybe and to me the main reason to build a 318 is 3.31" stroke and rpm.