You can install a 194 CI engine cyl head to raise the compression. Its a direct bolt on depending on what year 250 you have.
Track testing ,& racing against my friends car, it was the fastest naturally aspirated combination I ever had using the 194 cyl head. Mid 13's in the 1/4 mile.
Also, Mr Hotrod6 set an ET & MPH record w/a 194 cyl head, his MPH record still stands today.
IIRC, I milled .050- .060" off the 194 head & it was my daily driver w/12:0 compression . 230 PSI of cranking pressure. Pump gas 91 octane.
What year engine is your 250?
1.84" intake & 1.60" exhaust valves & some bolt in lumps
http://www.t6racing.org/id4.html would work very well. Relieve the chamber wall some & bowl work.
I had 12:0 compression ratio w/307 SBC flat top pistons & a milled 194 cyl head.
MBHD
