Those are 273/318 heads used from 68-74.
Here are the block casting numbers you should look for.
2465330 273 1964-66 LA
2806030 273 1966-69 LA
2463252 273 - LA
2536130 273 1965-69 LA
2806130 273 1966-69 LA
2264230 318 1960-66 A Polysphere
2468230 318 - A Polysphere
2532630 318 - A Polysphere
2466090 318 1967-74 LA
2806030 318 1966-69 LA
2806030 318 1967-74 LA
2536030 318 1967-75 LA
2566080 318 - LA
4104230 318 - LA Race - Painted Orange
72 Satellite 2 door, she wants a roadrunner clone, sorta... LOLLooks like carter carb. You can build up that motor a bit, some here may disagree and say put in a 340 or 360, but you can get more performance out of it. Regarding the rear end, it depends how much you are going to abuse it, and with a manual trans and higher horse power, might not be a bad idea to go with something bigger.
What car do you have with all this?