From a resale standpoint most people shy away from off brand engine swap combinations in anything past about 1955 or so (street (or"streets") rods of course are acceptable with almost any engine).

If your going to do a Marlin, I personally would put in the largest nastiest AMC engine you could find (the 390 or 401 engines were actually pretty decent for their day). Speed parts may be a little difficult to find but you never know what's going to show up on E Bay. Someone really good could possibly even modify an existing manifold to use with a blower and you would still come out cheaper and (IMO) have a car with a some sembelance of resale value, plus if done correctly one that could also be easily restored to original at a latter date.



Short story: I had a real good friend who passed away this year who was really into Chryslers (he owned several 300 letter series and 2 66 Chargers). As I found out, if you want to really get a rise out of a 66 or 67 Charger owner, walk up and tell him what a nice Marlin he has.