Considering re-powering

You have to be careful of this. For example if you look at a SCAT (aftermarket/forged) crankshaft for a 454. I don't know what Dart may use for their crankshafts if you buy a short or long/block from them. The oil holes are radius'ed by scat for better flow and dispersion to the bearings BUT they are radius'ed in one direction for a standard rotation and a I think the radius would be counter productive if you reversed the rotation and even possibly create additional wear and a shortened life.

Dart is primarily heads and blocks. You can get them anywhere from a partially machined casting to ready to bolt together. Choose crank and internals to suit your needs. I've had good luck with Ohio crankshaft. They will build to spec, any changes you need for a minimal charge. It's been a while since I've ordered custom stuff from them, so that may have changed.

Yes I know, I had a set of dart cast iron heads before. Dart does sell entire short blocks as well. It doesn't sound like the OP is going to build or assemble his own engine.

That is why I suggested a local performance shop. If a good builder has interest in doing a marine build, they could do a better job, cheaper than a marine crate engine. Plus, you would have the option of newer long rod set ups, newer head design, basically updated technology. It may not be the best option, but it shouldn't hurt to ask around a little.

I did refer to the dart block after it was mentioned that the stock blocks are 5k each to replace.

I think if the 454's are propped correctly that they'll run just as good as the old 427's you have now. I think buying all of the Crusader parts piece meal would be very cost prohibitive. Honestly, If I was in your postion even being as knowledgable as I am, I would buy complete drop in engines. Are 502's that much more expensive?

Have you reviewed this website?

Marine Remanufactured Engines Inboard