Any cam grinder can do your core if you have specs.Delta has many grinds for the 235 besides the so called Bulldog grinds.
I agree with Money pit,Tom has his agenda and that's all he knows,and from my experience,he actually knows not all that much about old Chevys.
The cam grinders say the rocker arm ratio on 235's and GMC's is 1.5.But it's 1.4 ,I've checked them out.So right out of the box,you're shy some lift and duration.
