Well another Maineiac huh. If yer thinking of SB you will need a little more money and or resources. Streets had a good suggestion (hes a little crazy shhh) with the 235 but a 250 is a good solid six that will bolt in if you are not planning on making any engine internals changes. and you can get one anywhere. If yer thinkin of doin internal engine work go 235. If ya keep it straight six overall cost and mods will be lower, unless ya can source out the necessary SB conversion stuff. Disc brakes?, Sb added weight, springs? I am currently SB a 63 nova and have six parts if ya want. Clifford 4bbl intake, split headers dual exh. I have loads of links books etc if ya wanna know more, feel free ta email me.

P.S. I grew up in Westbrook/Portland ME