Heres the info i just got from the guys at muscle motors take it for what it is.........heres the response i got asking about there low deck block.

Yes its true. We will have a machined block next weekend at the Monster Mopar show @ Norwalk. We will also have them at the Mopar Nations in Columbus a few weeks after that. Yes we have a cross bolted, big bore 400 block available. 400 or 440 main sizing is available and well as big diameter cams. Priority main oiling and oil to the lifters is standard. We don't anticipate having inventory for about a year. Everything is built to order for right now. $1700 deposit gets your place in line. then 6-8 weeks we will be ready to deliver the block and the balance is due when it is ready to ship.

All block B, RB wedge, RB Hemi all start @$3800 and are small bore

Big bore
big cam
Big main in 400 block
cross bolt #5
Bushed lifter bores
Are all upgrades and will incur additional cost.

Cast and machined in the USA, steel billet caps and ARP main studs std.