Yes it’s a roller cam motorlooks like a roller cam block from the pictures.
Yes the heads are 4323303 with the heart shape. They would need to be rebuilt. There is one threaded accessory boss that is broken on one of them.nice, the heads should be #302 swirl port chamber that look like heart shape. #308 are 360 heads.If not cracked(they had a problem with them cracking between the I&E) are a good head for a 318.I know you are going aluminum but someone may want them.
I think you will be happy with the way it runs. I installed a 85 318 roller in my D350.
In October I picked up a 1967 Plymouth Belvedere II. The car came out of Missouri and made it to Massachusetts before I bought it. It came with a 273 V8 with a Commando intake/cam, Holley 4 BBl, MSD billet distributor, 904 trans with a B&M shifter, 8 3/4 rear. The car is super clean, undercarriage is pristine. The interior is close to mint minus a few rips in the seat fabric and three cracks in the dash. How I bought it.
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