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1 - you can run whatever air cleaner you want2- The factory 351/FMX driveshaft is 51 3/32" ctr to ctr of the u-joints, the one for the toploader is 50 13/16". That's "fairly" close and may work, depending upon the yoke you use. The FMX is 31 spline, the toploader is 28 spline.3 - I personally wouldn't run an Autolite 4300A. A simple Holley 1850 600cfm or a 3310 750cfm will do the trick for a stock engine. I'd also much rather get an older Holley and rebuild it than roll the dice on a new one.4 - I've only ever run unleaded in my 351C engines, 2V or 4V. I run 93 in the 351C in my 71 which has a *true* 10.5:1 compression ratio. 16° initial and a conservative 18° curve in the mechanical, with heavy springs to slow the advance. The stock as-built ratios were much lower than what Ford advertised, so that "11:1" 1970 engine is really only around 9.8:1.[ATTACH=full]92959[/ATTACH]
1 - you can run whatever air cleaner you want
2- The factory 351/FMX driveshaft is 51 3/32" ctr to ctr of the u-joints, the one for the toploader is 50 13/16". That's "fairly" close and may work, depending upon the yoke you use. The FMX is 31 spline, the toploader is 28 spline.
3 - I personally wouldn't run an Autolite 4300A. A simple Holley 1850 600cfm or a 3310 750cfm will do the trick for a stock engine. I'd also much rather get an older Holley and rebuild it than roll the dice on a new one.
4 - I've only ever run unleaded in my 351C engines, 2V or 4V. I run 93 in the 351C in my 71 which has a *true* 10.5:1 compression ratio. 16° initial and a conservative 18° curve in the mechanical, with heavy springs to slow the advance. The stock as-built ratios were much lower than what Ford advertised, so that "11:1" 1970 engine is really only around 9.8:1.
[ATTACH=full]92959[/ATTACH]
