Have a '68 Commando Convertible, have purchased a '69 commando rolling chassis for spare parts, it had a running engine. Starting to rebuild engine from rolling chassis, found it to have a 231 in it. Stamped in block 3.8. Still in oddfire configuration. Keeping as oddfire! Boring .30 over. A few questions, (1) How to determine year of block and heads, appears both have been reworked. (2) Where to get new crank or rebuild current one. (3) 231 manifold appears different than 225, continue to use current Rochester Carb? (4) Will electronic ignition/distributor I up graded 225 to tranfer to 231, any year? Any other info will be greatfully appreciated as usual.