VINTAGE ROAD RACING QUESTION

Troub said

Greetings!
While still in the midst of restoring my 67 Dart Ive decided to point the resto towards some SVRA racing. Being that the 273 was the biggest offering for the Dart in 67 I need to source one to replace my slant six. Will it have to be correctly 67 date coded or can it be any pre-1972 block? The rule sheet isn’t clear and I’m a novice so any vintage racers out there?
Your help would be appreciated.
Thanks,
Troub

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My brother builds vintage Cosworth/Ford DFV’s, BDA’s aka 1600’s, Lotus 1600 Twin Cams, BDG’s aka 2,000’s, Hart 420r’s and other motors for vintage F1, F2, formula fords (FF) and such that run in CSRG and SVRA. From what I have helped him with, dates on blocks don’t matter. It’s that the motor is build to the cubic inch, or CC that is specific to said class and car of that period. (You don’t want to be the guy in the class that gets called a cheater and get a motor tare down.) He built a DFV over the winter for 1975 Shadow DN5 that has a brand new block, that was cast in 2019 with new cams, valves pistons, etc. Also Ford / cosworth is casting new blocks for the BDA for FF because there is such a demand for that motor. each rebuild gets new pistons, (bores are honed about .0004 each rebuild), valves and other necessary parts. Look at all of the old 289 Mustangs that are running, you think all of them are running old blocks, some but not all...