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.
Yup. The plunger travel within the lifter itself will allow the pushrod to be slightly longer than needed. We are building a mild low maintenance engine. The two barrel carb, points and solid cam were at the top of the list of things that HAD TO change.