Soak the manifold bolts with PB Blaster every day for a week before you do the job, you will have a better chance of getting them off without snapping them. As for header bolts, you can never do poorly with good quality bolts like those provided by ARP. I think some manufactureres also produce bolts with hex heads for those tight clearance areas like the ones in between the middle cylinders. The bigger the primary pipes are the tighter the fit will be.
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Dan
'46 2 door
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