The best solution I've found for leaky gaskets (both ends) are the "dead soft" gaskets. Only leak I ever had was because I didn't tighten the collector bolts after installing the engine, and lost a bolt. I replaced the bolt and no more exhaust leaks. I think that the close proximity you mention is just the nature of the design. You might gain some clearance around the control arm by using the next two (towards the firewall) motor mount bolt holes in the frame. Good luck and keep on truckin'...................Jerry
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'68 c-10 long wheelbase fleetside, been in family since new, originally 250 3 speed
Now (389) 350 .060 over 3.75 stroke,Edelbrock Performer RPM 70cc heads and Intake
600 cfm Edelbrock,Small Comp Cams retro-roller cam and roller rockers,9:1 cr, headers, HEI,Old Air a/c, 72 power disc brakes w/stainless lines, 3.42 gear,T-56 6-speed, original paint(what's left of it). Dakota Digital Dash
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