We have built both 400/512 and 440/512's and one 440/526.....All were 440Source....We have built a lot of them....The 512 is a beast over a 496, and so is the 526...You want tire frying killer power....Go big...We have also noticed the cap walk with the 440 is better than the 400....I always thought it would be the opposite. All of are's are done with girdles and good parts...All are kept to 6700rpm or less..

The one we have not done is a 440/543....A 4.5" crank is a big crank in a stock block.....I would love to hear feedback on one of these

'70 Cuda,...605 EFI Hemi Street Car (6.20 best pass, 1.33 60ft)
https://www.youtube.com/watch?v=WYw6RA-k5Bk (6.25 at 108.75mph from inside car)
https://www.youtube.com/watch?v=3zQEb9uxFng (6.25 at 108mph from outside car)
https://www.youtube.com/watch?v=JCvfzsC4NgM (9.9)

'66 Barracuda AWB Stretched nose Blown 440 Car in build stage

'71 Duster Drag Car 400 Low Deck 512 best 6.002 at 115.44mph
https://www.youtube.com/watch?v=Znuo3jMUXTk