Mine was a roller too. The only thing that will change things is if your valves are longer or recessed into the head. The roller lifter is longer, but you use a shorter pushrod to compensate.
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'79 T/A 6.6 4-sp, 3.23 , 463" E-heads, 252/262 hyd roller, TII, Holley 830, 8.384 @ 93.86 - 1/8, 12.5 @ 116 - 1/4, 2.035 60', 3800 lbs. w/o driver
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