It doesn't take much to get one to reliably take 600 hp.
I built my own with really not much more than better clutches and steels and a TA manual valvebody.
It has over 7,000 miles and hundreds of dragstrip passes. I do try to inspect it at least annually as we have started spraying a 250 shot on top of the 600 n/a.
Low band apply valvebody and NOT doing 1st gear burnouts are keys to longevity with the 727.
'63 Dodge 330
11.19 @ 121 mph
Pump gas, n/a, through the mufflers on street tires with 3.54's. 3,600 lbs.
10.01 @ 133mph with a 250 shot of nitrous an a splash of race gas. 1.36 60 ft. 3,700 lbs.
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