I don't have my old MP Catalogs available. I think they made a couple different ones. 4.50 bore

What I know:
4 bolt main
4.38 Bore
Water Cooled
Cast in 2003

What I don't know:
Siamese?
Capable overbore?

Right now its an aluminum rod 540 built as a Truck Pull or Mud truck that ran alcohol.
I have to get it apart to determine cam and a few other things.

Thanks in advance.

1969 Hemi Charger R/T,
1970 Charger 472 Hemi 6 Sp
1969 Charger Pro Tour Project
1971 Barracuda Convert
1970 440 6pack Superbird,
1968 Fury I Police Pursuit 440 Super Commando 2 door sedan (Black/Blue)
1967 Barracuda Convert
1968 Barracuda Coupe
1972 Charger Rallye wanna be RT
1972 Sebring Plus 440-6 Clone
1969 Coronet Pro Street
2009 Challengeer SRT8 stick
1992-1986 Body 2500 4x4 440 stick
1982 Ramcharger 318 Sniper- getting enhanced.
1991.5 W250 Cummins- Big Chief