I dont think your car will go 10's with the .509, carb is too small, converter needs more stall and it's too heavy.
I reckon 11.20-30
JMHO Mick


69 Dart GTS 440 mopar .590 cam, Edelbrock heads, 3200#
best et 6.45, 106.78, 10.14, 132.88 mph, 1.47 60ft
best 60ft 1.36