I'm running big fat 195/65 x 15's on the front of my 1972 4/4, and have not noticed an issue with the BRBs (which I fitted with the original wheel/tyre combo)

Changed my rear springs a few years back and fitted some BCC 5 leaf springs on the recommendation of Peter Ballard (SSL). Great improvement. Also fitted his uprated adjustable armstrong valves, and made some bumpstops from a design he sketched for me. Along wth the panhard, it massively improved the handling and ride quality.

You can see the difference in springs in this photo

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Here's the bumpstops:

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1972 4/4 4 seater, 1981 MGB GT
1984 Harley Davidson Electra Glide, 1990 Kawasaki ZX10