1965 Barracuda 273 rebuild...intake code?

My head casting numbers are 2465315-2 and I do have a set of solid lifter rockers/arms/lifters for it that I bought earlier for just in case purposes. I believe the heads are stock for 64-65? correct? Also the badging on the car says Commando V8 and the intake air cleaner is an original chrome Commando 273 air cleaner, so I'm guessing that the engine block (2806030-273-7) is not the original and may be entirely different? I did some checking on the VIN and it all matched up as a 273 Commando with Hi-Po engine and 4 speed tranny made in California. I guess I'm going to have to pull it the heads off to determine the bore and crank dimensions. Thank you guys for all the feedback and info...it relly helps!!
It sounds like you are on the right track. When you pull the heads look at the piston tops. These are the low compression 2 barrel pistons which are probably the ones you have. 4 valve reliefs.

273 pistons.jpg