I’m not sure where to even start with this! I’m looking for info on changing an early (59-62) 394 to a later (63). I recently had an engine built for my 1963 Starfire and the builder for whatever reason used an earlier 394 engine. He was very aware of my year model car! I have unfortunately a lot of money in this engine for it to be the wrong year model. That’s water under the bridge for now but I have what I think is going to be a big issue! While looking at the pics that he has sent me of the engine it appears that the water pump is tucked closer to the engine on the earlier 394. With this being said I feel the pulleys from my 63 power steering and alternator are not going to line up with the harmonic balancer, water pump etc. The other reason I think my pulley system won’t work is due to my car having an alternator and the 59 60 61 and 62 had a generator. Is there anything I can do about this?