What state is that 1969ronnie ? My cars are asking if we can move there.

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/6 '67 Barracuda convertible, electronic ignition, 4-OD, street cam, SBP KH discs, 3.55 SG 7.25" 1" t-bars. Bilstein.
340 '67 fastback, Doug Nash 5-speed.
1988 Toyota pickup work truck

There is no reason to use a domed piston in a 225 SL6.
Note: The domed pistons in the H-Pak kit were designed for the "zero deck" 170 and just happened to also fit into a 225, so they were used there.

Honestly, today's 'hot combo" for a high performance / high compression tall block SL6 is based on around the 198 con rod and 2.2 piston design. (long rod engine)

In general, a 225 SL6 with a deck height in the -.045 to -.020 range will get you over 10 to 1 compression with an unmilled cylinder head.
DD