273/ 2 barrel camshaft options

The cam in post #14 is quite small, may not have have as much 'oomph' as the original cam. That is because solid lifter cams with 018" lash are equivalent to about a hyd cam 9* shorter at 050. So equivalent to a 189 @ 050 hyd cam; equivalent meaning, gives equivalent performance.
Also, using a re-ground cam might lead to lash adjustment problems because the base circle of the cam is reduced in size; consequently, lifters sit lower & rocker adjustment screw needs to be screwed in further to get the correct lash. Ok if there is enough thread on the adjuster.....

I agree with others that the Isky E-4 cam is best. Isky cams are good. If you do not want lifter/lobe failure, have your old lifters re-faced; they look in reasonable condition. Do not buy new lifters, they fail.
NEVER, EVER USE USED LIFTERS ON A NEW CAM....NO MATTER HOW GOOD THEY LOOK.