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Hudson,
Nice work! Gas-N from the Boston area came out to make the headers for my race car and the 289 Superformance road cars and built the headers in a similar way as you did. They placed the flange against the block and through trial and error made the pipe bends using various short pieces until they fit. This was going to be their template for future sets so that they could use the pipe bender.
If at some point you have to take the engine out of the car after the body is on, when it comes time to put the engine back in you will have to put the headers in before dropping the engine in, as they will not fit in there afterwards due to the forward strut tubes and interference from the steering assembly and pedal box. On my car you can remove the forward strut tubes and so the only header that has to go in before the engine is the driver's side one due to the steering mechanism and pedal box.
Jim
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