I am going with the bbc 454 that i have, and is the starter in different location for marine use, can a truck block be retrofitted ?

I’d stay with the BB and add a Bravo drive and you’ll be happy for a long time. Replace as much cast iron off the BB with aluminum bits and you should be close to the oem small block.

Caveat: I really know Jack **** of what I’m talking about but that would be my path to explore.

will the starter location be same on a truck 454 block as it was on the 350 sb that came in boat?

Im trying to use the flywheel cover that came with boat, also trying to id if block it mark IV or gen V, it has a fuel pump mount but block off plate bolted to it and also has hole for crank sensor on bottom of timing cover ? Any help appreciated

starters are in the same location on a SB and BB, unless a top mount rear CCW starter is used in a trans application

1st time tryin to post pic. Here she is old but solid transom

^ looks good!

If you spend some time going through the Mercruiser parts diagrams, you should have a good idea of what you have and what is required to make the swap....

https://www.mercruiserparts.com/part...ndrive-inboard

Thank you

Merc had 330hp BBC in front of Alphas for a couple of years. Late 80s maybe? waiting on the Bravo. A friend had one he bought new that lasted until he decided he wanted to hop it up quite a bit, then it didn't make the next summer.