I have used the econo W2 heads with the Mopar Performance offset rockers for 8 years plus on a dirt track 408" motor with NO problems. I use solid/flat tappet cam,,NO roller. If you re going roller, it costs mucho' more to get heads to work proper. Mine are standard valve length heads with a 130#/330# spring set up, .580"-ish lift. No push rod clearance issues.

If you like drag racing, support your local track.