906 or 915 ?

As I understood this thread, the o.p. has a set of stock 906s, in unknown condition, verses buying a running set of ported 915s off a running ten second car.
I also understood they were going in a factory M-code 440 A-body, so aluminum heads are OUT!
Given the choice of dumping a buttload of money in a 906, or buying ported 915s in running condition, .....it's like a 2024 ticket of biden/fetterman. A true no-brainer.