I had a similar crack on a small block manifold but was on the portion that bolts up to the header pipe. I never repaired and had no issue with it all.
I have about quit messing around with 50 plus year old exhaust manifolds and have been purchasing the repros. The casting numbers in most cases are correct, and the date code can't be read when the manifold is on the car and its nice to have a part that has not heat cycled dozens of times. Just my .02 worth.
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65 Corvette Coupe L78
67 427/390 Vette Coupe unrestored
67 L-79 Vette roadster (Top Flight)
69 L71 Roadster Survivor
69 L46 Roadster Survivor (Sold)
69 Z/28 RS (Sold)
69 Dodge Charger R/T
70 W30 442 Auto Air Survivor
2016 Z06 Coupe M7
70 AAR Cuda (Sold)
69 L78 Chevelle (Sold)
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