Dinosaur parts , even at my age I wouldn't even consider it unless you are doing a true nostalgia piece. HEI's are so simple.I'm not going to say they didn't work though. there are good and NOT real good ones .The Accel 37XXX series with upper bearing were Good. I think the idea was to allow more dwell , i remember the hot trick was to shut off one set on the top end for more top end MPH.my .02 ,DAVE
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"been there, done that, ruined the T-shirt".
2007 LBZ GMC Sierra, ECSB
2006 LM7 RCSB Silverado
98 Vortec project.
94,3500,6.5L 4L80
81 SWB GMC POS finally gone
73 Pinto, stock, w/CragarSS's-eww 
84,C10 SWB-Yella,stock
86 K10 SWB-Red, hopped up 305,4/S
LOTS of Cummins trucks.
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