[TR] tire question

[Carl TR]

Boy can I taste it.... The tires on the car are still 'new' but are 9 years old.  Obviously I live in 'warmer' climate but they have been 'garaged' the whole time.   Should I be concerned about internal deteriation?   I don't expect to do anything but normal driving - some at highway speed.
 
If I get new tires - there is limited availability in 165r15 even if 165/80R15s are included. 
 
Prices below include s/h & mount Bal:
Nantang CX688 @$79  400AB (made in Tawiwan I think)
Nexen SB802 @ $82  380AB (also Taiwan)
Federal SS567 @$104 420AA (made in China)
Kumho Power Star 758 @ $105 400AB (local incl tax)
Firestone F560 @$114 280A? (165-15)
Vredesting Sprint @130 220AB (165-15) 

BFGoodrich WW @$170 580BB (165-15) has 3/4" ww
Michelin XZX @ $242  no ratings (165-15)
 
Dunlop SP series no longer available. (that is what is on the car) 
 

Does it make a difference whether a tires heat rating is an A or B?
All have a tread pattern with straight grooves around the tire except the Michelin & Vredesting which have a squiggly 'S' pattern.
 
I think I have narrowed it to nantang, federal or kumho (advantage of kumho is local dealer)

 
Any input?  
 
Carl
1961 TR3A - TS81802LO
mysite.verizon.net/cfmtr3a
Tampa, Florida