My street 69 GTX is very similar to your RR. 493 with 11.4 compression. Pump gas set up. Eddy performers ported by Modern (325 cfm @ 600 lift) custom solid roller 620 lift and 260 duration. (car has power brakes that work perfect)MSD ignition, Street Dominator with a 4150 holley 1000 cfm carb.
3.73 gears, caltrack springs, bars and shocks on stock front and rear suspension. 3960 lbs with driver.275/50/15 Hoosier drag radial
Car has gone 1.49 60 ft and 10.84 at 123.50.
I broke a 10 inch Turbo Action twice! I talked to Paul and he recommended the tightest 8 inch because it had all the heavy duty internals. (remember we have HEAVY cars) It has been in the car since about 2004 with about 15,000 street miles and well over a thousand passes. Very easy to drive on the street. I launch off idle at around 1100 RPM. Nice street/strip converter.
Oh yeah, this thing makes 494 RWHP