Originally Posted by 52 Merc
The engine could be the 226 or the 254 flathead 6. Both are the same physical size, and have many interchangeable parts.
I'm gonna bet it's a 254 as that carburetor looks like a Holley 897. If it is a 254, the head & block should have casting numbers that start with 8MTH rather than 7HA, right?