Hi, I´m from Argentina. Please, excuse me for my poor English.

I´ve got a ´69 Mustang, 302. Originally equipped with rare low compression heads (C8OA-E), 63 cc combustion chamber volume.
The last year, one head was cracked and I thought in a new pair of aftermarket heads, but they were unaffordable to me.
I´ve got a pair of D8OE, from 1980 Ranger already ported by a local unexperted man.

I guess the exhaust ports are too big and not safe to use.

Please, I´d like your opinion about this.

Thank You, very much!