69 dodge dart questions

Your setup is almost identicle to mine other than fenderwell headers.I only
have 1/8 mile time,8.40s bad air no traction in street trim.Is your dart
tubbed?All i had for tire was a 245/60R15 radial t/a.

This same engine came out of dads race car back in the 80s,was running
7.50s in a 3400lb car 5.13 gear w/thermoquad.Not real specific but maybe
give you an idea.