Robert. According to my Sun Tach I have the idle @ 1000 RPM's when its in Park and it drops to about 800 RPM's in gear. As for the pulleys, they are the stock factory 440 engine pulleys, whatever that ratio is. Fan shroud is also the factory shroud made for the 22 inch A-body big block radiator. As for suction, if you hold a piece of paper close to radiator it will suck it up and hold it to the radiator. Now if that's enough air flow or not I'm not sure. As for the fan being 1 inch away from the rad I too was thinking that's a little to close. I have a slightly smaller fan spacer I'm going to try, but its only going to pull the fan back another 1/4 inch. So it will then be 1 & 1/4 " away from the rad. Truthfully I don't think its going to make much of a difference. I will advance the timing back up to around 15* and install a new Milodon high flow 180 stat in place of the 160 stat. Other then that I'm out of ideas, except for buying a different and new 22 inch rad. Thanks.