Drilling new holes in 13b manifold
 

I bought a 13b Rotary engineering Dual weber setup online, and was told it was for a 12a. My question is how well would the carb setup run if i were to drill new holes, and have the runners be slightly off? Or am i better off to try to sell it on ebay, and just buy a new carb and manifold setup for a 12a

there is an adapter plate that can make it work. Maybe.

I have one to put a 12A intake on a 13B. Should just be the reverse