Cost and special parts to turbo

I wouldn't be looking to add a lot of boost, just like you said 7~8 would be what I would want to run.

Even with that low boost, you'll still need a modified blow thru carb and a boost referenced fuel supply,

But, even 7 pounds of boost makes a 225 the equivalent of a 330 cid engine... a nice pick me up....:cheers: