Pinto engined westfield - need suspension advice

[BoyRacerChaser]

My westfield is in need of new suspension.

Some reason i cant add a post to the wscc site, and it wont let me search either!?
So i would appreciate the help.

I have a pinto engined westfield circa 150bhp, live axle SE narrow body.
The car currently has spax fitted but they are knackered.

I was wondering for fast road and a bit of track use what the best setup would be, spring rates wise.
So far after my research i was thinking 300lbs springs on the front and 175lbs rear.

Any makes considerably better than others? All seem to be similar price, avo, protech, gaz...

Thanks in advance for the help.