currently on my 64 k10 with the 383 sbc and stock sm420 trans, I've got these sanderson block huggers:
https://www.sandersonheaders.com/san...ab-description
I've had plenty of problems with the collector flanges, and after finding they cracked after roughly 5 years, I cut them off and welded tubes downward to solve that. however there were other cracks formed all over the place...
so I did the same searches on the 60-66 forum which in their faq has plenty of header choice posts...
based on those posts, I settled on Hedman long tube #69090
https://www.hedman.com/product-detail/69090
*** note: I have not installed them yet .. but from previous posts, they'll work without 'too much hassle' ... which was the best endorsement I could find
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1964
K10 shortbox Stepside
383 sbc stroker under vortec heads
sm420 trans / t221 tcase / corp 10 front axle / corp 12 rear axle / 3.73 gears
rolling on 33x12x15 tires on 6 lug rims.
