$100 Ebay cam??- go to enginekits.com, they sell elgin solid lifter cams for $69- there american made and good I've used them.
Or go to competitionproducts.com, they have elgin cam + oiling solid lifters with the .024 edm that lets oil spray onto the cam lobes, I think the cam/lifters is $160- dirt cheap when compared to comps edm solids and solid cam which are in the $280 range as a combo
Cam is too big, be careful angle milling heads, stuff doesn't end up fitting (headers, intakes, gaskets) decking the block would probably be better since you are just messing with pushrod length for proper valvetrain alignment.
Atleast consider something in the 230-240 range- in a 350 that should be good to 6,000-6,500
Look up Reeds Cams- he used to grind Winston Cup cams from late 70's until mid 90's knows his stuff, he'll take all your wants and make the appropriate compromises.
Best of luck