If I am building a FFR Mk4 roadster, I am going to do something "greater than moderate" with the engine. I've had fox body mustangs with the 302, and they were fun. I can't wrap my head around the 347 and the way you have to relieve the block, and the way the bottom ring protrudes when the piston is down.

I want a 351W.

Can anyone make any recommendations? Things to look out for? Blocks to look out for? Reputable engine builders for a short block?