Also, don't take my post the wrong way; I also think you should try to find a 261 or 235 first, but if you can't you could plug a 230/250 or SBC in. (And you could always go back to a 261/235 if you find one)

Chaz

Some of my crap:
1963 C-30 flatbed dually 292/SM420
1965 C-10 LWB fleet 250/column shift 3 speed
1965 C-30 9' stepside 250/SM420/4.10 gears (my DD)

Website I made for my crap:
http://www.66submarine.com