Crush Sleeve on a '72 12 BLT Elco

[Malyki]

K guys,
I'm up grading a single leg 12 blt on my '72 Elco. & have come across this crush sleeve scenario . From what I've read it's kinda critical to get this right. So any & all suggestions welcome.

I'm runnin' a:

Porshe Red '72 Elco
Race Prepped '00 350
.040 over w/H beems
Ported & Polished '69 461 Fuelies
Edlbroock RPM AIR Intake
W/750 Street HP Holley
Elect Fuel Pump
3" pipes w/ 40 Series Flowmasters

Stage 2 Performance Auto
700r4

I'm Buildin up This 12 BLT w/
Auburn Pro Limited Slip
Richmond 3:42 Gears & Kit
Moser Axles, Gears & Studs
Moser Axle Cover

Again Thanks in Advance
l8trs