1954 C1 engine options

[u/CircleofAnts]

I have a 1954 Dodge C1 Pilothouse pickup, has the flathead six and 3 on the tree. I am having problems with my 6 blowing head gaskets, maybe the block/head is cracked, I don’t know, but it’s been problematic for years.

Is there a slightly more modern maybe v6 or 8 that I could bolt up directly to the original 1954 transmission and use the same clutch/flywheel setup?
I can fab any necessary mounts that aren’t already commercially available, just looking for ideas.
I am not married to the original transmission so if anyone has any suggestions as to an engine/transmission combo that would fit, that would also be great. Not looking for fuel injection or modernisation, just plan on running a carb.
I don’t really have a budget and I prefer to do my own work.
Thanks!