I use a Howards hydraulic roller that sounds perfect for what you are doing. It's around .544 lift and 243° duration. Go to their website. Use a Crane composite gear and a Howards fuel pump pushrod.
The best advice is to have your Source heads CNC ported by someone like Modern Cylinder Head. You'll have well over 600 hp with very minimal effort.
'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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