Here are the stats. I'm looking for 450whp and low 12's or high 11's at the track

1968 Camaro

Motor:
406
cast crank
5.7" rods w/ ARP bolts
Crane 252@ .590/600"
Not sure about the heads yet
Victor Jr. intake
750DP Demon carb
Hooker 1 3/4" headers
Turbo 350 w/ B&M 3500 stall
4.11 rear

Help identify these heads. I thought they were old Dart II iron heads but I am not sure. Can I build with them or are they garbage? If so, I will have them ported and flow tested. Here are the stats of the heads.
2.02/1.6"
64cc
1.5" dual springs with damp
valve guids
1.5 roller rockers


If anyone can tell me what kind of heads these are I would greatly appreciate it. Not sure if they will work with this motor or if I need to upgrade.

https://www.dropbox.com/s/vv9pgg9cm3...51331.jpg?dl=0

https://www.dropbox.com/s/r5pvplsd4a...51431.jpg?dl=0