[brainsboy]

You cant stroke a motor without increasing the head demand. If you plan on keeping the windsor heads I wouldnt even bother stroking your motor, you will have a better running motor with the 302 then you will with 347ci with stock 351w heads.
Assuming your friend has the "Good" 69-74 351w heads, they are still too restrictive. If your on a budget, skip the stroking and use that money to buy a set of aftermarket heads or ... If your wanting size that badly then I would start with a 351w instead.

Ben