I have one of these.
http://www.manciniracing.com/ben2pivaspto.html
If the heads are off...
PROFORM HEAVY-DUTY MANUAL VALVE SPRING COMPRESSOR
View attachment 649909
https://www.jegs.com/i/Proform/778/...MI35LsxcOp3QIVgQOGCh2eXACbEAQYCiABEgIYZPD_BwE
Made this one up years ago for my Buick, you couldn't get anything else to work with the motor installed bc the brake booster and A/C box were in the way. After drilling a couple more holes I used it to change the springs on my 440 after break in. View attachment 649921
It looks like it would.Thanks! It worked out perfectly, unlike my other attempts at making things easier.
I have one of these & it still needed modifications to work well, but does work. For mounted heads I used a K-D 2400 for many years, changing springs between rounds when needed.
Am I going to be able to use this one on a bench? Hope so as I ordered it an hour ago.I have one of these.
http://www.manciniracing.com/ben2pivaspto.html
I think I can clamp it or bolt it down.I suspect you need to figure out a way to hold the head down while you compress the spring.