i picked up a set of DOOE heads which is what your probably referring to.
'69-'70 351's
By the time you put all the work into them...they are not worth it.
The heads are only worth about $100 anyway.
also you would need hardened valve seats.
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4.10's,long tubes & 75 shot...Goes 12.50's
Check it out at
http://www.burnouts.webprovider.com