I think you will have to cut the spring towers. That's why they engine bay is bigger on the 67-68's.
Why don't you stroke a 302 or better a 351W. Now you can have you cubic inch and it will fit. PLUS !!!! no one can tell the size from the outside. I know you're thinking that you can tell the difference between a 302 vs 351, so can I. But, most people can't. Like Ch**Y people. You can stroke a 351 to 426, I am in the process of doing just that.
Lighter and more power too.
Think about it, no substitute for cubic inch.
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