Just got a set of these heads today. Flat tappet springs.
I have some 1.5 prw rockers so i might check this tonight.
For some reason I just thought about blending the ridge from the top cut into the chamber so I googled it.
found this below.
Seems it will be worth it, might blend the top cut. Smooth the bowls if needed and gasket match. And get a backcut on the intake valves..maybe even get the valve job fancied up a bit haha.
Just need to find some valves with the margin removed..