I have used AFRs in the past on other brands of motors, never had an issue.. the SBM ones fall in line with like SM and edelbrock.. nothing special. but i trust AFR more than the others...
That being said.. i just looked on summit and they are selling an assembled head for $840 which is a good price...
The ones that are $620 are bare although summit shows a pic of a complete head.
The only thing that bugs me bout the AFRs is they started from scratch, could have made something to take on trickflow at the same or better price point but instead said.. naw.. good enough....