Hotsauce has it ........ the trans is probably at the limit with the stock VX engine .........
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more hp - someone said 'there is no substitute for cubic inches ... of course, this was probably said before Honda developed a 1.5 litre F1 engine with 1010 horsepower (*with* reliability btw) ......
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so, look for a big block Chevy and a THM400 trans ........ and then someone willing to fabricate the parts to make it work ........
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then - of course - the small VX rad (boy is it small) will need to be replaced with something larger ........
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and on and on an on .......