I have straight dumps on my '72 and there's plenty of clearance. But mine's a 4x4; the motor is mounted back in the I-6 position.
See this post, it has a good explanation:
http://67-72chevytrucks.com/vboard/s...threadid=44042
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72 Chevy K20 Custom Camper, 350/350, 4" lift, dual shock suspension front & rear. Daily driver and a work in progress.
00 Suburban LT
90 Camaro RS
79 Yamaha XS1100 Special (Ol' Reliable)
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