If the springs sit too high the valves must be too long as well. This would give you your clearance problem rather than the pushrods, even if those are mismatched. I haven't a standard one to hand that I can measure but I'm sure someone has. Rocker mount bolts are thin and weak. The long length from head to thread mean they twist like a torsion bar before breaking. 20 ft/lbs max for these.
The valve spring seats, on the head, might have be machined to suit the larger springs so you might not easily be able to use standard ones again.
Good luck with it.
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