70 TR6 and unleaded petrol solutions?

["Gene M." <MClan@postoffice.worldnet.att.net>]

I am curious what people with older TR's are doing now that the petrol 
is unleaded.  Are there replacement valve seats which need to be put in? 
 Lead substitutes-any good brands or sources (local stores seem to be 
phasing out a lot of the brands).  Anyone running a stock engine with no 
problems on the unleaded stuff?  I am in Calif. & we might have other 
additives that might cause problems. Any input will be appreciated.

Gene M.
70TR6 CC52098