Rv 440 + 6-71 ?!?

My .02: I had zero room for a fan between the fan and radiator. Pusher fan up front. Mech water pump is fine since it will run off the same belt as the alt. I see no point in running an electric pump. I also dropped the PS to pick up some clearance between the blower drive and radiator. Space is at a premium with a BB Blown a-body. Trust me.

The advice on cams above is standard however BDS blowers recommends a cam with 110* LSA for street use. That's what I had on hand and that's what I used. You'd be fine with that unless you were racing and wanted every last ounce of power. Engine will run cooler too.

You're gambling with a single crank key but may be fine. The blower companies all recommend a double key. I have a hub instead of a harmonic balancer. The belt absorbs harmonics. Either approach is valid (assuming the engine is internally balanced). If you go the balancer route, an SFI rated unit is recommended (not a stock one).

5-7 psi will make plenty of power on the street. But do the research and know what your static compression is before choosing a pulley combo. No point in genading the thing the first time around the block. You will have to overdrive a 6-71 to make boost on a 440. Around 7% will put you in your target boost range.

Opinions will vary. As in everything, it's your choice to follow advice or not - what's important is that you make informed decisions. Also, even with a budget build in mind, be prepared to spend more than you thought.