Yet another 273 build advice thread!

Call Jim at Racer Brown. We were talking at one point and he had measured the correct length. For something to think about, T/A heads exhaust rockers are on center just like any normal Small block. To get the most from any cam I'd measure and get exactly what I wanted. But, on the other hand, hydraulic lifters are pretty forgiving. I personally run solid lifters in everything I can though.