Small update:
Finaly I decided to take the heads off and do all this the right way, valve stems will be trimmed and shortened. Machining in my country is still pretty reasonable at around 150$ for both heads.
Cam will be mentioned above Howard's solid roller with .600 lift but I will use it with 1.6 roller rockers making it .640 lift on intake and exhaust. Excluding .022 lash it will be effective .618 cam.
For springs I will use Howard's double springs rated:
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Rev limitter will be set to 6400 with this cam.
Can someone let me know how 1.6 rockers affect cam duration?
if cam is 245/253 @ .050 with 1.5 rockers what is the duration at .050 with 1.6 rockers?
Advertised duration for this cam is 277/285.
I already have all the parts excluding lifters.