I used that pro-form valve spring compressor and didn't like it. The fork angle is not correct for a Pontiac head. It can work, but was dicey on some.
If I had it to do over, I would get a LSM one or weld something to the fork to make it flat to the spring.
Here are the LSM ones:
https://lsmproducts.com/collections/...ng-compressors
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1965 Pontiac GTO
455/469 w/ #48 Heads, '65 Tri-Power
9.25:1 CR
Stump Puller Cam
Muncie M22W 1st-2.56 2nd-1.75 3rd-1.37 4th-1.00
3.55 Rear Differential
Front: 225/60R15 Height: 25.6"
Rear: 275/60R15 Height: 28"
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