I'd be a hypocrite if i say i don't or haven't used the parts mentioned on this post. I have an Eagle crank and rods in my 377" motor that has gone 5.16 and 8.26 in a dragster and runs 6.50's in my 3250lb Malibu 2 yrs. old, i also have a 434" with a scat crank, but with Lanotti promod rods. No matter what you use in a 4340 stl. it's better than factory stuff. I think everyone who posted here just wanted to alert the person that he was not getting the best product available. I personally know the limits of the products and stay within them, that's why i run them. If i were build an all out engine no matter what size, i would opt. for better parts. IE: example, my 383", blown alcohol 1471,buzzard catcher motor has, a Lanotti, black crank, BME alum. rods, and Arias blower pistons, because i don't want to run over the parts at 1/2 track when i'm already having enough trouble just getting down the track. The motor has already been 4.61 in the 1/8 when it was a 358" motor @ 2600lbs, it's now going in an 1800lb Anglia as a 383" motor earley next yr.
just my .02
Zip.