Summit Racing has them listed it looks like. 

https://www.summitracing.com/parts/aay-fds-fyb-351


DiLL

Expensive is right. If I could afford $2300, I would go the extra mile and buy John's heads instead. 

... hmm ...

GM 1-Wire ALT
GM PS PUMP
Wonder if it will mount a FRIGIDAIRE AIR COMPRESSOR?
Does it come with an AC-DELCO drive belt?

Might as well add a CHI-COM CARB and HEI DIST and go for the gusto ...

Better yet, jack the car up and run a 350 and TH-400 under it.



EDIT -

There is more than one kit - https://shop.allamericanbillet.com/all-american-billet-ford-y-block-detail.htm?productid=-9795370

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Pricing is well within range for a system like that.  While there is bound to be a premium for a Y-Block version due to low production, the pricing seems reasonable for someone who wants this.  I would imagine that the accessory pullies, and idlers / tensioners are "standard" items and the crank pulley, water pump pulley and brackets are unique for the Y.



Lawrenceville, GA

Never thought I would see this come to pass. New kind of life for the YBlock. Not one I would ever dabble in due to the price I think. Looks well thought out. But I don't agree with the wholesale changeover of parts to get to this point. Would definitely have to see a major horsepower increase proving it. Ted, Whatcha think?

       A  L  A  N   F  R  A  K  E  S   ~  Tulsa, OK