A500 or 727 with GV?

lets get real if you are going to run a 400 to 500 hp. 360 eng. on the freeway you would want it to run 2800 to 3400 rpm's to keep it clean, Run it at 20 or 2300 and it will carbon up in 500 miles, save your money and keep the 727. a 400 + hp 360 will idle very rough I would say about 1500 rpms min. so you will need at least a 3500 stall converter. gas mileage is going to be low so if you can'nt afford a engine that gets 8 to 12 mpg. only build it to 275 hp. good luck Gary