348 '58 engine in my '59?

[Irishgoodbye]

Just confirming the 348 sitting in my '59 is non matching, thrown in there by the previous owner. Factory A/C car but...
Block date code: D2458
Casting: 3751872

Heads: 3732791
(assuming for now since no spark plug water passages)
Still have remove valve covers to be sure.

All this points to 1958 cars only if the info here is correct.
Thanks!

 

[1958 delivery]

April 24 1958

 

[1958 delivery]

April 24 1958 Late 58 HAS the cooling holes Not to be used with 791 heads

 

[Irishgoodbye]

Yeah, holes are plugged currently. Whole lot of goofiness going on.

 

[Phil Reed]

You shouldn't have to take the valve cover to see that.

 

[Irishgoodbye]

Nah but to get the #’s

 

[fourzeronine]

April 24 1958 Late 58 HAS the cooling holes Not to be used with 791 heads

A block from that timeframe will have the pads for the coolant passages, but they may not be drilled. If the 791s are original to it - which is possible - the pads will be blank. I have a March '58 block with pads sans holes.

 

[Irishgoodbye]

Thanks for the info guys and all the casting numbers on the homepage. Think I’m gonna leave the block but change out the heads and intake since it clearly didn’t come with the car to begin with.
The engine is stroked with forge internals and I’m sure those heads an intake are just suffocating the rest of the engine