I'm partial to the blower route seeing as I have a blown 340. Here are the pros to sticking with the smallblock. Number one is fit. Number two is you already have most of the parts. These are very big considerations. I prefer the roots blowers as evidenced by my Dyers 6-71 but the procharger type setups do make big HP and TQ.
No matter which way you go it will cost a few dollars. I pieced mine together over a 2 year period and my total cost was right around $4000, that included all the machine work and parts. So it can be done relatively cheap.
Jack
