pushrod question????

[hard-charger]

hi all! im putting my engine together and realized that i dont have the pushrods. 
im gonna be running a 440 with a zero deck, and eddy heads, a engle cam with specs like a kv3 int. and kv4exh. kinda like that. and have isky adjustable rocker arms.
ive seen some different pushrods out there, and some have different lengths, and some are hardend.
question is; what would be an ideal pushrod for my kinda engine.
im gonna be spinning it hard. around 6500+ mabey less? depends on what it likes when i run it.
ive found some crane pushrods from mancini racing, they were around $82.00 and some crane hardend pushrods from summit, around $107.00. (they looked like the same thing, only hardend)
and some from 440source. that confused me, cause they were a different length alltogether. for about $80.00
so if anybody has any recommendations, id like to soke up some nolage on the subject.  thanks all!!! 

[Chryco Psycho]

use a Chrome Moly pushrod , you will probably need a custom length , I often end up assembling the engine & measuring the pushrod I need & waiting 2 weeks to get them made , Crane Or comp or Smith bros will make them for you in 5/16 or 3/8 diameter & with the correct ends & length needed