Stroker Smallblock cost
I use the 320 HP PM Crate motor in 65 Barracuda, Im also using 1 5/8 (recommended for this motor by MP) headers. All the other bigger HP motors in the MP catalog called for 1 7/8 headers. The 320 Hp Motor, 10.95 inch clutch, and 3.23 sure grip fries the 235 60X15 street tires. However, I have read post form other crate motor customers that had major motor problems because oil consumption during break in is way higher than you would expect and failed to check there oil regularly.
The other concerns I had was cutting the hood to clear the carburetor, my air cleaner bolt just touches the hood pad.
The Clutch can be handled two ways as long as you use the original Z bar mounting on the cars body panel. The 273 clutch fork is smaller than the normal fork and made to clear the exhaust pipe, you can use it with any 10.5 inch diaphragm clutch. I had a good muffler shop manufacture my exhaust pipes, you may have trouble if you purchase pre-made set. You cant use the 273 fork with a Borg and Beck high performance clutch (mine is a 10.95 MP scallop clutch) because of the grater pedal pressure required. But, you can use the conventional fork and mounting plate with a high performance Borg and Beck clutch, because the fork angles downward to clear exhaust pipe and is longer. Be prepared to manufacture a bellhousing Z bar mount and a special Z bar for both applications. I salvaged several Z bars and cut them in the center to get the length and lever orientation correct and then modified the lower lever to fit the application, then welded the results.
Good luck with your project
