W/2's or Edelbrock?

Well I pulled valves out of one hd.& taking to hd. shop tomorrow to ck. flow??? These would only be drag hds. if ok;-weal see?? One thing I found odd is the rocker shaft hold dn. blocks,they have holes 90% apart and also in the m/p books they're talking about a bolt & spacer deal for ported hds.? I didn't get bolts. Any help guys? ,remember I'm an old school big blk. guy