I have CAD files for the 300 intake spacers if anyone is in need. They were made for me at no charge and I'm happy to share them if needed. I got a quote from sendcutsend and each spacer in .500 thickness is $122
You can use Edelbrock Performer 215/Rover intake or later Rover Fuel injection on a 300 Buick. You also need a valley cover plate.
Where do you get the valley cover from? So you can take a stock '65 iron head 300, use these spacers along with a Edelbrock 215 intake and a valley pan - and youre good to go?
Ports are closer in size with the 300 aluminum heads. Smaller port on intake is better than the other way. Valley plate can just be a sheet of 1/4" aluminum. BritishV8 Forum: Re: Buick 300/350 stroker thread
I'm using that pattern to build a custom blower intake for my 300 on TA heads. I have a dozen more pieces to add and the lower unit will be ready to machine, then I plan to cerrakote it. I'll try to post a photo or two soon. Jim