Wheel and tire help

[Ezzz]

Hey guys, need some wheel and tire help.

My '69 has a vortec 4.8 with a t56 behind it, 4.56 gears with a posi and is lowered 4/6.5. I plan on doing a cam and wcch stage 2 heads, but as it is I can't help but spinning the tires all the time and never use first. I have 16x10 cragar 69 deluxe wheels (smoothies) with temporary wimpy 255 tires that barely fit.

I'd like to stick with the wheels I have but can't find anything sticky, tall, and wide in 16". Mickey Thompson recently discontinued the two sizes in 16" that I was looking at so I'm leaning towards going up to 18" and going with the nitto nt555r in 305/45R18 (almost 29" tall).

Does anyone know a 16" tire that's over 28" tall and hopefully around 305 wide?

Otherwise does anyone know of a 18x10 smoothie in 6x5.5 that comes in black or I could powder coat black?

Also, what's the real world performance difference between steel and aluminum? I'm guessing there's a pretty noticeable weight difference.

Now I'm rambling but would 16" up front and 18" out back look funky if I go that route?