Is there a block lift kit that will fit a 69 Barracuda

The largest tires that fit in a 69 Barracuda are 325/50-15s on 10inch rims.
Second largest are 295/50-15s also on 10s.
The standard backspace on those is 4.5 inches.
To install those. you will have to move the spring inboard to at least flush with the inner wheelwells.
Then you will need to narrow your rearend to move the wheels to that inner well surface less 3/8 inch per side, to allow for body sway in the turns.
Then you will still need to roll up the outter knife-edges vertical to prevent the tires being cut.
To prevent you having to narrow the rearend, you can increase the backspace to about 6 inches, but for 295s you will still have to move the springs.
My conclusion is twofold;
1) you are not trying to fit the largest tires that will fit, and
2) you got the wrong backspace wheels.

Your cheapest, and best solution therefore is to just get the right backspace wheels.
As to more height at the rear, that is a personal preference, and in a 6-cylinder car, anything goes.
But remember this;
do learn to drive it differently before you go testing the cornering limits.
And ; the brakes don't work when you are sliding sideways; you are gonna have to ride it out. So leave yourself some run-off room,lol.
And; 10" wheels with a 6" backspace, are IMO, ugly.
And if you are running adapters to use 4.5 lbp wheels on the sbp axles; well, now, you need another inch of backspace, so now up to 7, which IMO, is fuglier than 6 was.

BTW, on the bottom left of every post, is an EDIT button, that when you punch it, allows you to go back into your post and make changes to it. Changes like spelling and punctuation. Please take the time to make your post say what you mean.